Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets

MO 27.31: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Spectroscopic analyses on the excited states and reactivity of homo- and hetero nuclear transition metal complexes in solution — •Anneken Grün¹, Rahel Schepper¹, Yvonne Schmitt¹, Felix Armbruster², Florian Walz², Steffen Styra², Sandra Gonzalez-Gallardo², Frank Breher², and Markus Gerhards¹ — ¹TU Kaiserslautern, Fachbereich Chemie Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern — ²Anorganische Chemie, KIT, Engesserstraße 50, 76131 Karlsruhe

Spectroscopic properties of potentially catalytical active homo- and hetero nuclear transition metal complexes were studied in solution by multiple methods: FT-IR-spectroscopy, UV-spectroscopy, fluorescence and fluorescence lifetime measurements, using the time correlated single photon counting method (TCSPC). This method enables the analysis of electronically excited states of substances with weak fluorescence intensities like in case of the investigated species tris(3,5-dimethylpyrazolyl)silanide-Mo(CO)₃-Cu(I) and [Pd₃{Si(mt^Me)₃}₂]. The spectroscopic properties of these transition metal complexes are compared to those of the pure ligands.

For the triangulo palladium cluster [Pd₃{Si(mt^Me)₃}₂], which is of particular interest due to its function as homogenous catalyst for C-C-coupling reactions in the electronic ground state, an IR analysis should give an insight into the reaction mechanism. Using a thin layer liquid cell it is possible to follow the [Pd₃{Si(mt^Me)₃}₂] catalyzed formation of reaction products in a Sonogashira-like coupling reaction of 4-ethynylaniline via FT-IR-spectroscopy.